Systolic Blood Pressure in a Population of Infants in the First Year of Life: The Brompton Study
1 Department of Paediatrics, Cardiothoracic Institute, and the Medical Research Council, Tuberculosis and Chest Diseases Unit, Brompton Hospital, Fulham Road, London
Systolic blood pressure (BP) was measured by the Doppler technique and random zero sphygmomanometer in a sample of infants between the ages of 4 days (n = 1,740) and 1 year (n = 1,338). Mean systolic BP rose from 76 mm Hg at age 4 days to 96 mm Hg at age 6 weeks in babies awake, and showed little further variation at 6 months and 1 year. The BP was approximately 6 mm Hg higher in babies awake than asleep. Blood pressure was nearly normally distributed at all ages and the 95th percentile for BP of babies awake was 95 mm Hg at 4 days and 113 mm Hg between 6 weeks and 1 year. A comparison of intra-arterial and Doppler BP confirmed that both inflation bag length and cuff width are important for accurate measurement.
Submitted on May 18, 1979Accepted on August 14, 1979
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